Rotary piston internal combustion engine



1966 WOLF-DIETER BENSINGER ETAL 3,

ROTARY PISTON INTERNAL COMBUSTION ENGINE Filed 001:. 1, 1964 FIG. I

INVENTORS.

WOLF-DIETER BENSlNGER HANS-OTTO DERNDINGER V ATTORNEYS.

United States Patent 3,292,601 ROTARY PISTON INTERNAL COMBUSTION ENGINE Wolf-Dieter Bensinger, Stuttgart-Riedenberg, and Hans- The present invention relates to a housing casing for a rotary piston internal combustion engine, especially for an internal combustion engine of trochoidal construction, which includes a water space, preferably one that extends around the entire casing.

The present invention is based on the problem of so constructing a housing casing of this type that for purposes of saving weight and cost it can be manufactured as light-metal pressure-casting. In solution of the underlying problems, the present invention essentially consists in that the water space is provided in the axial direction toward each side with an aperture, preferably extending about the entire casing and adapted to be closed by a cover. By reason of the lateral apertures of the water space in the housing casing, the water space may be formed-out during the casting operation completely in steel and adapted to be removed or pulled out; and the parts of the casting mold have to be removed or withdrawn in an advantageous manner only axially after the casting operation. No special mechanical requirements are made of the covers which close off the water space in the completed and assembled housing casing since they are supported by the side parts of the housing to be attached laterally at the housing casing. Consequently, the covers may be made of sheet metal; however, they may also be pressure castings.

According to a further feature of the inventive concept, the water space may be provided within the housing casting with a center wall extending about the entire casing in order to achieve in this manner, on the one hand, a completely satisfactory connection between the radially inner wall and the radially outer wall of the housing casing and, on the other, to obtain a simple and compact construction of the casting mold parts to be removed on both sides in the axial direction.

The covers laterally closing the water space may be secured in an advantageous manner by means of a glueing material; for the glue has to take over primarily only a sealing function because the lateral parts, which are secured in the usual manner by anchor-bolts or the like on both sides at the housing casing, relieve mechanically the glued joint.

Accordingly, it is an object of the present invention to provide a housing casing for rotary piston internal combustion engines which is simple in construction, can be easily manufactured, and avoids those drawbacks encountered heretofore with the prior art constructions.

Another object of the present invention resides in the provision of a housing casing for a rotary piston internal combustion engine which may be made of light-weight metal pressure-castings in order to save weight and costs.

Still another object of the present invention resides in the provision of a housing casing for rotary piston internal combustion engines which can be readily cast out in steel by the use of a pressure-casting process without difliculties in removing the molds and forms needed to provide the required recesses or apertures.

Still another object of the present invention resides in the provision of a housing casing for rotary piston internal combustion engines which includes a water space for the 3,292,601 Patented Dec. 20, 1966 circulation of cooling water that can be readily sealed-oil by covers attached thereto in an extremely simple manner.

These and further objects, features, and advantages of the present invention will become more obvious from the following description when taken in connection with the accompanying drawing, which shows, for purposes of illustration only, one embodiment in accordance with the present invention, and wherein FIGURE 1 is a plan view in the axial direction on a housing casing of a rotary piston internal combustion engine in accordance with the present invention;

FIGURE 2 is a cross-sectional view through the housing casing taken along line II-II of FIGURE 1; and

FIGURE 3 is a partial cross-sectional view, On an enlarged scale, illustrating the housing casing with glued-on cover.

Referring now to the drawing wherein like reference numerals are used throughout the various views to designate like parts, the housing casing illustrated therein is provided for purposes of its manufacture as a light-metal pressure-casting with a radially inner wall 1, a radially outer wall 2, and a center wall 3 extending around the entire casing and connecting the inner wall 1 with the outer wall 2; additionally, the center wall 3 subdivides the water space arranged between these 'two walls 1 and 2 into two partial water spaces 4 and 4'. Each partial water space 4 and 4' is provided in the axial direction of the housing casing with an aperture 5 and 5', respectively, extending about the entire casing. The apertures 5 and 5 make it possible to cast out in steel each partial water space as a unit and to remove or withdraw the casting mold parts (not shown) in the axial direction after the pressure-casting operation in a simple manner.

The annularly shaped sheet metal covers 6 and 6 serve for closing the apertures 5 and 5. The covers 6 and 6' are attached in the axial direction at the housing casing in such a manner with that the outer surfaces of the sheet metal covers 6 and 6' come to lie in one plane with the axial boundaries of the housing casing; that is, are flush with these boundary surfaces. The covers 6 and 6' are held in this position by glueing or bonding at the housing casing. Any suitable glue or bonding material known in the prior art may be used for that purpose. As illustrated more clearly in FIGURE 3, the rims 7 and 8 of the cover 6 are coated for that purpose with a suitable known glueing or bonding substance. The glued or bonded joint is far-reachingly relieved mechanically since laterally parts are attached on both sides at the housing casing which are connected with the housing casing by draw-bolts or the like. Consequently, the glued joint has to assume primarily only a sealing function.

While We have shown and described only one embodiment in accordance with the present invention, it is understood that the same is not limited thereto but is susceptible of numerous changes and modifications as known to a person skilled in the art; and we, therefore, do not wish to be limited to the details shown and described herein, but intend to cover all such changes and modifications as are encompassed by the scope of the appended claims.

We claim: 1. A housing casing for a rotary piston internal combustion engine, especially an internal combustion engine of trochoi-dal constnu ction, comprising:

housing casing means provided with water space means extending around the housing casing means and essentially consisting of a light-metal pressure casting,

said housing casing means including radially inner and outer walls and central wall means connecting said inner and Outer walls and subdividing said water space means,

said water space means being provided in the axial direction toward each side with aperture means extending around said housing casing means,

said housing means being bounded on each side by a plane surface portion,

and cover means for closing said aperture means,

said cover means comprising a pair of ring members received in said aperture means and having outer surfaces coplanar with a respective said surface portion. 2. A housing casing for a rotary piston internal combustion engine, especially an internal combustion engine of troohoidal construction, comprising:

housing casing means provided with water space means extending around the housing casing means and essentially consisting of a light-metal pressure casting,

said housing casing means including radially inner and outer walls and central wall means connecting said inner and outer wall and subdividing said water space means, 7

said water space means being provided in the axial direction toward each side with aperture means extending around said housing casing means,

said housing casing means being bounded on each said side by a plane surface'portion, said aperture means extending through said plane surface portion on each said side,

and cover means comprising a pair of ring members having plane outer surface portions for closing said aperture means,

and saidring members being secured by an adhesive joint in said aperture means in positions in which the said outer face portions of said ring members are coplanar with a respective plane surface portionof said housing casing means.

3. A housing casing for a rotarypiston internal com- 5 bustion engine, which can be made as light-metal pressure casting, can be formed-out completely in steel molds, and permits the simple withdrawal of the mold parts, comprising:

References Cited by the Examiner UNITED STATES PATENTS 2,413,589 12/1946 Snyder. 3,091,386 5/1963 Paschke 123-8 X FOREIGN PATENTS 1,316,240 12/ 1962 France.

941,029 11/ 1963 Great Britain. 943,693 12/ 1963 Great Britain.

MARK NEWMAN, Primary Examiner.

F. T. SADLER, Assistant Examiner. 

1. A HOUSING CASING FOR A ROTARY PISTON INTERNAL COMBUSTINE ENGINE, ESPECIALLY AN INTERNAL CONBUSTION ENGINE OF TROCHOIDAL CONSTRUCTION, COMPRISING: HOUSING CASING MEANS PROVIDED WITH WATER SPACE MEANS EXTENDING AROUND THE HOUSING CASING MEANS AND ESSENTIALLY CONSISTING OF A LIGHT-METAL PRESSURE CASTING, SAID HOUSING CASING MEANS INCLUDING RADIALLY INNER AND OUTER WALLS AND CENTRAL WALL MEANS CONNECTING SAID INNER AND OUTER WALLS AND SUBDIVING SAID WATER SPACE MEANS, SAID WATER SPACE MEANS BEING PROVIDED IN THE AXIAL DIRECTION TOWARD EACH SIDE WITH APERTURE MEANS EXTENDING AROUND SAID HOUSING CASING MEANS, SAID HOUSING MEANS BEING BOUNDED ON EACH SIDE BY A PLANE SURFACE PORTION, AND COVER MEANS FOR CLOSING SAID APERTURE MEANS, SAID COVER MEANS COMPRISING A PAIR OF RING MEMBERS RECEIVED IN SAID APERTURE MEANS AND HAVING OUTER SURFACES COPLANAR WITH A RESPECTIVE SAID SURFACE PORTION. 